You never know when you might come across a valuable error coin, so it helps to know what to look for. Here's a look at five of the most valuable error coins.

Old pennies that have been stamped twice during the minting process and have been circulated throughout the United States by accident have long been selling for thousands of dollars. In January 2023, ...

Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime steel ...

A 'rare' 20p coin has sold for almost 200 times its shop value because of one subtle error. What's more, the Royal Mint suggest more are still to be found. The 2008 ...

A 'rare' 20p coin has sold for more than 211 times its face value on eBay this month.

Minting coins isn't exactly an exact science. Even though most coins are perfect and uniform, small mistakes can result in error coins that are super valuable and ...

A rare 20p coin has sold for nearly 200 times its face value after being listed on eBay. The undated coin, minted in 2008 and listed as having a 'mule error,' sold for £39.99 on Monday, January 5.